wtf is he getting power for? what is his final destination?

Kill the black dragon that killed him in his past life, I guess... and avoid earth extinction, because he noticed people on earth lacked power to defeat the dungeons. Not that he cares for people, but it would be hard for him to live in the middle of so many monsters

wow you literally gave me the most direct spoiler ヾ(☆▽☆)

I'm so sorry Σ( ￣□￣||) but the dragon thing is on the beginning of the story, and for the rest... don't worry, there's A LOT of things I didn't say so it's not a big spoiler. But again, sorry for not putting a spoiler tag

Hahaha, i meant it as a joke I'm not upset about the spoiler more like happy to know! (≧∀≦)